Comment by rootusrootus

It's opaque, and limited. They buy the raws from China just like everyone else, then reconstitute them, fill vials, and drop them in the mail. They'll only provide a COA if you ask them to, and it will just be one basic mass/purity test most often.

In the gray market, there are multiple mass/purity tests for a batch (to look for variation in fill, mostly), as well as tests for endotoxins, sterility, heavy metals, and fentanyl. Rarely (maybe never; I have certainly never seen it) will a compounder do these additional tests and provide the results.

I think in general the well-known compounding pharmacies (e.g. Hallandale, BPI, couple others) are probably reputable enough to feel okay with. The mom & pop ones (or med spas) I'd be a lot more nervous about. Often ends up being someone who's just reconstituting vials in their living room, and maybe not with the quality controls you'd like to see.